﻿# The MIT License (MIT)
# Copyright (c) 2014 Microsoft Corporation

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
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"""Create, read, and delete databases in the Azure Cosmos DB SQL API service.
"""

from typing import Any, Dict, Iterable, List, Mapping, Optional, Union, cast
import warnings

from azure.core import MatchConditions
from azure.core.tracing.decorator import distributed_trace
from azure.core.paging import ItemPaged
from azure.core.credentials import TokenCredential

from ._cosmos_client_connection import CosmosClientConnection, CredentialDict
from ._base import build_options, _set_throughput_options
from .offer import ThroughputProperties
from ._retry_utility import ConnectionRetryPolicy
from .database import DatabaseProxy, _get_database_link
from .documents import ConnectionPolicy, DatabaseAccount
from .exceptions import CosmosResourceNotFoundError


__all__ = ("CosmosClient",)



CredentialType = Union[
    TokenCredential, CredentialDict, str, Mapping[str, Any], Iterable[Mapping[str, Any]]
]


def _parse_connection_str(conn_str: str, credential: Optional[Any]) -> Dict[str, str]:
    conn_str = conn_str.rstrip(";")
    conn_settings = dict([s.split("=", 1) for s in conn_str.split(";")])
    if 'AccountEndpoint' not in conn_settings:
        raise ValueError("Connection string missing setting 'AccountEndpoint'.")
    if not credential and 'AccountKey' not in conn_settings:
        raise ValueError("Connection string missing setting 'AccountKey'.")
    return conn_settings


def _build_auth(credential: CredentialType) -> CredentialDict:
    auth: CredentialDict = {}
    if isinstance(credential, str):
        auth['masterKey'] = credential
    elif isinstance(credential, Mapping):
        if any(k for k in credential.keys() if k in ['masterKey', 'resourceTokens', 'permissionFeed']):
            return cast(CredentialDict, credential)  # Backwards compatible
        auth['resourceTokens'] = credential
    elif isinstance(credential, Iterable):
        auth['permissionFeed'] = cast(Iterable[Mapping[str, Any]], credential)
    elif isinstance(credential, TokenCredential):
        auth['clientSecretCredential'] = credential
    else:
        raise TypeError(
            "Unrecognized credential type. Please supply the master key as a string "
            "or a dictionary, or resource tokens, or a list of permissions, or any instance of a class implementing"
            " TokenCredential (see azure.identity module for specific implementations such as ClientSecretCredential).")
    return auth


def _build_connection_policy(kwargs: Dict[str, Any]) -> ConnectionPolicy:
    # pylint: disable=protected-access
    policy = kwargs.pop('connection_policy', ConnectionPolicy())

    # Connection config
    # `request_timeout` is supported as a legacy parameter later replaced by `connection_timeout`
    if 'request_timeout' in kwargs:
        policy.RequestTimeout = kwargs.pop('request_timeout') / 1000.0
    else:
        policy.RequestTimeout = kwargs.pop('connection_timeout', policy.RequestTimeout)
    policy.ConnectionMode = kwargs.pop('connection_mode', policy.ConnectionMode)
    policy.ProxyConfiguration = kwargs.pop('proxy_config', policy.ProxyConfiguration)
    policy.EnableEndpointDiscovery = kwargs.pop('enable_endpoint_discovery', policy.EnableEndpointDiscovery)
    policy.PreferredLocations = kwargs.pop('preferred_locations', policy.PreferredLocations)
    policy.UseMultipleWriteLocations = kwargs.pop('multiple_write_locations', policy.UseMultipleWriteLocations)

    # SSL config
    verify = kwargs.pop('connection_verify', None)
    policy.DisableSSLVerification = not bool(verify if verify is not None else True)
    ssl = kwargs.pop('ssl_config', policy.SSLConfiguration)
    if ssl:
        ssl.SSLCertFile = kwargs.pop('connection_cert', ssl.SSLCertFile)
        ssl.SSLCaCerts = verify or ssl.SSLCaCerts
        policy.SSLConfiguration = ssl

    # Retry config
    retry_options = kwargs.pop('retry_options', None)
    if retry_options is not None:
        warnings.warn(
            "'retry_options' has been deprecated and will be removed from the SDK in a future release.",
            DeprecationWarning
        )
    retry_options = policy.RetryOptions
    total_retries = kwargs.pop('retry_total', None)
    retry_options._max_retry_attempt_count = total_retries or retry_options._max_retry_attempt_count
    retry_options._fixed_retry_interval_in_milliseconds = kwargs.pop('retry_fixed_interval', None) or \
        retry_options._fixed_retry_interval_in_milliseconds
    max_backoff = kwargs.pop('retry_backoff_max', None)
    retry_options._max_wait_time_in_seconds = max_backoff or retry_options._max_wait_time_in_seconds
    policy.RetryOptions = retry_options
    connection_retry = kwargs.pop('connection_retry_policy', None)
    if connection_retry is not None:
        warnings.warn(
            "'connection_retry_policy' has been deprecated and will be removed from the SDK in a future release.",
            DeprecationWarning
        )
    connection_retry = policy.ConnectionRetryConfiguration
    if not connection_retry:
        connection_retry = ConnectionRetryPolicy(
            retry_total=total_retries,
            retry_connect=kwargs.pop('retry_connect', None),
            retry_read=kwargs.pop('retry_read', None),
            retry_status=kwargs.pop('retry_status', None),
            retry_backoff_max=max_backoff,
            retry_on_status_codes=kwargs.pop('retry_on_status_codes', []),
            retry_backoff_factor=kwargs.pop('retry_backoff_factor', 0.8),
        )
    policy.ConnectionRetryConfiguration = connection_retry
    return policy


class CosmosClient:  # pylint: disable=client-accepts-api-version-keyword
    """A client-side logical representation of an Azure Cosmos DB account.

    Use this client to configure and execute requests to the Azure Cosmos DB service.

    It's recommended to maintain a single instance of CosmosClient per lifetime of the application which enables
        efficient connection management and performance.

    CosmosClient initialization is a heavy operation - don't use initialization CosmosClient instances as
        credentials or network connectivity validations.

    :param str url: The URL of the Cosmos DB account.
    :param credential: Can be the account key, or a dictionary of resource tokens.
    :type credential: Union[str, Dict[str, str], ~azure.core.credentials.TokenCredential]
    :param str consistency_level: Consistency level to use for the session. The default value is None (Account level).
        More on consistency levels and possible values: https://aka.ms/cosmos-consistency-levels
    :keyword int timeout: An absolute timeout in seconds, for the combined HTTP request and response processing.
    :keyword int connection_timeout: The HTTP request timeout in seconds.
    :keyword str connection_mode: The connection mode for the client - currently only supports 'Gateway'.
    :keyword proxy_config: Connection proxy configuration.
    :paramtype proxy_config: ~azure.cosmos.ProxyConfiguration
    :keyword ssl_config: Connection SSL configuration.
    :paramtype ssl_config: ~azure.cosmos.SSLConfiguration
    :keyword bool connection_verify: Whether to verify the connection, default value is True.
    :keyword str connection_cert: An alternative certificate to verify the connection.
    :keyword int retry_total: Maximum retry attempts.
    :keyword int retry_backoff_max: Maximum retry wait time in seconds.
    :keyword int retry_fixed_interval: Fixed retry interval in milliseconds.
    :keyword int retry_read: Maximum number of socket read retry attempts.
    :keyword int retry_connect: Maximum number of connection error retry attempts.
    :keyword int retry_status: Maximum number of retry attempts on error status codes.
    :keyword list[int] retry_on_status_codes: A list of specific status codes to retry on.
    :keyword float retry_backoff_factor: Factor to calculate wait time between retry attempts.
    :keyword bool enable_endpoint_discovery: Enable endpoint discovery for
        geo-replicated database accounts. (Default: True)
    :keyword list[str] preferred_locations: The preferred locations for geo-replicated database accounts.
    :keyword bool enable_diagnostics_logging: Enable the CosmosHttpLogging policy.
        Must be used along with a logger to work.
    :keyword ~logging.Logger logger: Logger to be used for collecting request diagnostics. Can be passed in at client
        level (to log all requests) or at a single request level. Requests will be logged at INFO level.

    .. admonition:: Example:

        .. literalinclude:: ../samples/examples.py
            :start-after: [START create_client]
            :end-before: [END create_client]
            :language: python
            :dedent: 0
            :caption: Create a new instance of the Cosmos DB client:
    """

    def __init__(
        self,
        url: str,
        credential: Union[TokenCredential, str, Dict[str, Any]],
        consistency_level: Optional[str] = None,
        **kwargs
    ) -> None:
        """Instantiate a new CosmosClient."""
        auth = _build_auth(credential)
        connection_policy = _build_connection_policy(kwargs)
        self.client_connection = CosmosClientConnection(
            url, auth=auth, consistency_level=consistency_level, connection_policy=connection_policy, **kwargs
        )

    def __repr__(self) -> str:
        return "<CosmosClient [{}]>".format(self.client_connection.url_connection)[:1024]

    def __enter__(self):
        self.client_connection.pipeline_client.__enter__()
        return self

    def __exit__(self, *args):
        return self.client_connection.pipeline_client.__exit__(*args)

    @classmethod
    def from_connection_string(
        cls,
        conn_str: str,
        credential: Optional[Union[TokenCredential, str, Dict[str, Any]]] = None,
        consistency_level: Optional[str] = None,
        **kwargs
    ) -> 'CosmosClient':
        """Create a CosmosClient instance from a connection string.

        This can be retrieved from the Azure portal.For full list of optional
        keyword arguments, see the CosmosClient constructor.

        :param str conn_str: The connection string.
        :param credential: Alternative credentials to use instead of the key
            provided in the connection string.
        :type credential: Union[str, Dict[str, str]]
        :param str consistency_level:
            Consistency level to use for the session. The default value is None (Account level).
        :returns: A CosmosClient instance representing the new client.
        :rtype: ~azure.cosmos.CosmosClient
        """
        settings = _parse_connection_str(conn_str, credential)
        return cls(
            url=settings['AccountEndpoint'],
            credential=credential or settings['AccountKey'],
            consistency_level=consistency_level,
            **kwargs
        )

    @distributed_trace
    def create_database(  # pylint:disable=docstring-missing-param
        self,
        id: str,
        populate_query_metrics: Optional[bool] = None,
        offer_throughput: Optional[Union[int, ThroughputProperties]] = None,
        *,
        session_token: Optional[str] = None,
        initial_headers: Optional[Dict[str, str]] = None,
        etag: Optional[str] = None,
        match_condition: Optional[MatchConditions] = None,
        **kwargs: Any
    ) -> DatabaseProxy:
        """
        Create a new database with the given ID (name).

        :param str id: ID (name) of the database to create.
        :param offer_throughput: The provisioned throughput for this offer.
        :type offer_throughput: Union[int, ~azure.cosmos.ThroughputProperties]
        :keyword str session_token: Token for use with Session consistency.
        :keyword Dict[str, str] initial_headers: Initial headers to be sent as part of the request.
        :keyword str etag: An ETag value, or the wildcard character (*). Used to check if the resource
            has changed, and act according to the condition specified by the `match_condition` parameter.
        :keyword ~azure.core.MatchConditions match_condition: The match condition to use upon the etag.
        :keyword Callable response_hook: A callable invoked with the response metadata.
        :returns: A DatabaseProxy instance representing the new database.
        :rtype: ~azure.cosmos.DatabaseProxy
        :raises ~azure.cosmos.exceptions.CosmosResourceExistsError: Database with the given ID already exists.

        .. admonition:: Example:

            .. literalinclude:: ../samples/examples.py
                :start-after: [START create_database]
                :end-before: [END create_database]
                :language: python
                :dedent: 0
                :caption: Create a database in the Cosmos DB account:
        """
        response_hook = kwargs.pop('response_hook', None)
        if session_token is not None:
            kwargs["session_token"] = session_token
        if initial_headers is not None:
            kwargs["initial_headers"] = initial_headers
        if etag is not None:
            kwargs["etag"] = etag
        if match_condition is not None:
            kwargs["match_condition"] = match_condition
        request_options = build_options(kwargs)
        if populate_query_metrics is not None:
            warnings.warn(
                "the populate_query_metrics flag does not apply to this method and will be removed in the future",
                UserWarning,
            )
            request_options["populateQueryMetrics"] = populate_query_metrics

        _set_throughput_options(offer=offer_throughput, request_options=request_options)
        result = self.client_connection.CreateDatabase(database={"id": id}, options=request_options, **kwargs)
        if response_hook:
            response_hook(self.client_connection.last_response_headers)
        return DatabaseProxy(self.client_connection, id=result["id"], properties=result)

    @distributed_trace
    def create_database_if_not_exists(  # pylint:disable=docstring-missing-param
        self,
        id: str,
        populate_query_metrics: Optional[bool] = None,
        offer_throughput: Optional[Union[int, ThroughputProperties]] = None,
        *,
        session_token: Optional[str] = None,
        initial_headers: Optional[Dict[str, str]] = None,
        etag: Optional[str] = None,
        match_condition: Optional[MatchConditions] = None,
        **kwargs: Any
    ) -> DatabaseProxy:
        """
        Create the database if it does not exist already.
        If the database already exists, the existing settings are returned.

        ..note::
            This function does not check or update existing database settings or
            offer throughput if they differ from what is passed in.

        :param str id: ID (name) of the database to read or create.
        :param bool populate_query_metrics: Enable returning query metrics in response headers.
        :param offer_throughput: The provisioned throughput for this offer.
        :type offer_throughput: Union[int, ~azure.cosmos.ThroughputProperties]
        :keyword str session_token: Token for use with Session consistency.
        :keyword Dict[str, str] initial_headers: Initial headers to be sent as part of the request.
        :keyword str etag: An ETag value, or the wildcard character (*). Used to check if the resource
            has changed, and act according to the condition specified by the `match_condition` parameter.
        :keyword ~azure.core.MatchConditions match_condition: The match condition to use upon the etag.
        :keyword Callable response_hook: A callable invoked with the response metadata.
        :returns: A DatabaseProxy instance representing the database.
        :rtype: ~azure.cosmos.DatabaseProxy
        :raises ~azure.cosmos.exceptions.CosmosHttpResponseError: The database read or creation failed.
        """
        if session_token is not None:
            kwargs["session_token"] = session_token
        if initial_headers is not None:
            kwargs["initial_headers"] = initial_headers
        if etag is not None:
            kwargs["etag"] = etag
        if match_condition is not None:
            kwargs["match_condition"] = match_condition
        try:
            database_proxy = self.get_database_client(id)
            database_proxy.read(
                populate_query_metrics=populate_query_metrics,
                **kwargs
            )
            return database_proxy
        except CosmosResourceNotFoundError:
            return self.create_database(
                id,
                populate_query_metrics=populate_query_metrics,
                offer_throughput=offer_throughput,
                **kwargs
            )

    def get_database_client(self, database: Union[str, DatabaseProxy, Mapping[str, Any]]) -> DatabaseProxy:
        """Retrieve an existing database with the ID (name) `id`.

        :param database: The ID (name), dict representing the properties or
            `DatabaseProxy` instance of the database to read.
        :type database: str or dict(str, str) or ~azure.cosmos.DatabaseProxy
        :returns: A `DatabaseProxy` instance representing the retrieved database.
        :rtype: ~azure.cosmos.DatabaseProxy
        """
        if isinstance(database, DatabaseProxy):
            id_value = database.id
        elif isinstance(database, str):
            id_value = database
        else:
            id_value = database["id"]
        return DatabaseProxy(self.client_connection, id_value)

    @distributed_trace
    def list_databases(  # pylint:disable=docstring-missing-param
        self,
        max_item_count: Optional[int] = None,
        populate_query_metrics: Optional[bool] = None,
        *,
        session_token: Optional[str] = None,
        initial_headers: Optional[Dict[str, str]] = None,
        **kwargs: Any
    ) -> ItemPaged[Dict[str, Any]]:
        """List the databases in a Cosmos DB SQL database account.

        :param int max_item_count: Max number of items to be returned in the enumeration operation.
        :keyword str session_token: Token for use with Session consistency.
        :keyword Dict[str, str] initial_headers: Initial headers to be sent as part of the request.
        :keyword Callable response_hook: A callable invoked with the response metadata.
        :returns: An Iterable of database properties (dicts).
        :rtype: Iterable[Dict[str, str]]
        """
        response_hook = kwargs.pop('response_hook', None)
        if session_token is not None:
            kwargs["session_token"] = session_token
        if initial_headers is not None:
            kwargs["initial_headers"] = initial_headers
        feed_options = build_options(kwargs)
        if max_item_count is not None:
            feed_options["maxItemCount"] = max_item_count
        if populate_query_metrics is not None:
            warnings.warn(
                "the populate_query_metrics flag does not apply to this method and will be removed in the future",
                UserWarning,
            )
            feed_options["populateQueryMetrics"] = populate_query_metrics

        result = self.client_connection.ReadDatabases(options=feed_options, **kwargs)
        if response_hook:
            response_hook(self.client_connection.last_response_headers)
        return result

    @distributed_trace
    def query_databases(  # pylint:disable=docstring-missing-param
        self,
        query: Optional[str] = None,
        parameters: Optional[List[Dict[str, Any]]] = None,
        enable_cross_partition_query: Optional[bool] = None,
        max_item_count: Optional[int] = None,
        populate_query_metrics: Optional[bool] = None,
        *,
        session_token: Optional[str] = None,
        initial_headers: Optional[Dict[str, str]] = None,
        **kwargs: Any
    ) -> ItemPaged[Dict[str, Any]]:
        """Query the databases in a Cosmos DB SQL database account.

        :param str query: The Azure Cosmos DB SQL query to execute.
        :param List[Dict[str, Any]] parameters: Optional array of parameters to the query.
            Ignored if no query is provided.
        :param bool enable_cross_partition_query: Allow scan on the queries which couldn't be
            served as indexing was opted out on the requested paths.
        :param int max_item_count: Max number of items to be returned in the enumeration operation.
        :keyword str session_token: Token for use with Session consistency.
        :keyword Dict[str, str] initial_headers: Initial headers to be sent as part of the request.
        :keyword Callable response_hook: A callable invoked with the response metadata.
        :returns: An Iterable of database properties (dicts).
        :rtype: Iterable[Dict[str, str]]
        """
        response_hook = kwargs.pop('response_hook', None)
        if session_token is not None:
            kwargs["session_token"] = session_token
        if initial_headers is not None:
            kwargs["initial_headers"] = initial_headers
        feed_options = build_options(kwargs)
        if enable_cross_partition_query is not None:
            feed_options["enableCrossPartitionQuery"] = enable_cross_partition_query
        if max_item_count is not None:
            feed_options["maxItemCount"] = max_item_count
        if populate_query_metrics is not None:
            warnings.warn(
                "the populate_query_metrics flag does not apply to this method and will be removed in the future",
                UserWarning,
            )
            feed_options["populateQueryMetrics"] = populate_query_metrics

        if query:
            # This is currently eagerly evaluated in order to capture the headers
            # from the call.
            # (just returning a generator did not initiate the first network call, so
            # the headers were misleading)
            # This needs to change for "real" implementation
            result = self.client_connection.QueryDatabases(
                query=query if parameters is None else {'query': query, 'parameters': parameters},
                options=feed_options,
                **kwargs
            )
        else:
            result = self.client_connection.ReadDatabases(options=feed_options, **kwargs)
        if response_hook:
            response_hook(self.client_connection.last_response_headers)
        return result

    @distributed_trace
    def delete_database(  # pylint:disable=docstring-missing-param
        self,
        database: Union[str, DatabaseProxy, Mapping[str, Any]],
        populate_query_metrics: Optional[bool] = None,
        *,
        session_token: Optional[str] = None,
        initial_headers: Optional[Dict[str, str]] = None,
        etag: Optional[str] = None,
        match_condition: Optional[MatchConditions] = None,
        **kwargs: Any
    ) -> None:
        """Delete the database with the given ID (name).

        :param database: The ID (name), dict representing the properties or :class:`DatabaseProxy`
            instance of the database to delete.
        :type database: Union[str, Dict[str, str], ~azure.cosmos.DatabaseProxy]
        :keyword str session_token: Token for use with Session consistency.
        :keyword Dict[str, str] initial_headers: Initial headers to be sent as part of the request.
        :keyword str etag: An ETag value, or the wildcard character (*). Used to check if the resource
            has changed, and act according to the condition specified by the `match_condition` parameter.
        :keyword ~azure.core.MatchConditions match_condition: The match condition to use upon the etag.
        :keyword Callable response_hook: A callable invoked with the response metadata.
        :raises ~azure.cosmos.exceptions.CosmosHttpResponseError: If the database couldn't be deleted.
        :rtype: None
        """
        response_hook = kwargs.pop('response_hook', None)
        if session_token is not None:
            kwargs["session_token"] = session_token
        if initial_headers is not None:
            kwargs["initial_headers"] = initial_headers
        if etag is not None:
            kwargs["etag"] = etag
        if match_condition is not None:
            kwargs["match_condition"] = match_condition
        request_options = build_options(kwargs)
        if populate_query_metrics is not None:
            warnings.warn(
                "the populate_query_metrics flag does not apply to this method and will be removed in the future",
                UserWarning,
            )
            request_options["populateQueryMetrics"] = populate_query_metrics

        database_link = _get_database_link(database)
        self.client_connection.DeleteDatabase(database_link, options=request_options, **kwargs)
        if response_hook:
            response_hook(self.client_connection.last_response_headers)

    @distributed_trace
    def get_database_account(self, **kwargs) -> DatabaseAccount:
        """Retrieve the database account information.

        :keyword Callable response_hook: A callable invoked with the response metadata.
        :returns: A `DatabaseAccount` instance representing the Cosmos DB Database Account.
        :rtype: ~azure.cosmos.DatabaseAccount
        """
        response_hook = kwargs.pop('response_hook', None)
        result = self.client_connection.GetDatabaseAccount(**kwargs)
        if response_hook:
            response_hook(self.client_connection.last_response_headers)
        return result
